2. • A sedimentary rock consisting of sheets
of sand, mineral particles, and binding
matrix deposited one atop in water
environments and desert formations.
• Like sandpaper, sandstones usually
have a rough, granular texture.
• Brown, red, purple, and pink
sandstones are commonly called
brownstone
• A clastic type of sedimentary rock.
3. • A shale is a laminated or fissile
clastic sedimentary rock that composed
of predominance of silt and clay other
minerals , especially quartz and calcite.
• It characteristically contain fine-
grained silt and clay particles (<
0.063mm).
• If this fine-grained material lacks
layers, it is called mudstone or
claystone.
• These rocks are smooth to the touch.
4. • Conglomerate is a clastic sedimentary
rock made up of rounded clasts that are
greater than two millimeters in
diameter.
• The rounded clasts of conglomerate can
be mineral particles such as quartz
or feldspar, or they can be sedimentary,
metamorphic, or igneous rock fragments.
• A conglomerate rock will have a rough
texture
• A clastic type of sedimentary rock.
5. • Siltstone is a fine to medium-grained
sedimentary rock.
• It is pale grey or brown and quite soft.
Sometimes it contains thin layers
which are darker or lighter in color.
• It is hard and durable and do not easily
split into thin particles or layer.
• A clastic type of sedimentary rock.
6. • It is formed from chemical reactions
that combined iron and oxygen in
marine and fresh waters.
• It only occurs naturally in the earth's
crust.
• The ores are usually rich in iron oxides
and vary in color from dark grey, bright
yellow, or deep purple to rusty red.
• A chemical type of sedimentary rock.
7. • Chert is a sedimentary rock composed
of microcrystalline or cryptocrystalline
quartz, the mineral form of silicon
dioxide.
• It varies greatly in color (from white to
black), but most often manifests as
gray, brown, grayish brown and light
green to rusty red.
• It is a hard, aphanitic, non-clastic rock.
• A chemical type of sedimentary rock.
8. • Rock salt is the name of a sedimentary
rock that consists almost entirely of
halite, a mineral composed of sodium
chloride.
• It forms as isometric crystals and is
typically colorless or white, but may
also be other colors depending on the
amount and type of impurities
contained within it.
• A chemical type of sedimentary rock.
9. • Chalk is a variety of limestone
composed mainly of calcium carbonate
derived from the shells of tiny marine
animals known as foraminifera and
from the calcareous remains of marine
algae known as coccoliths.
• It is usually white or light gray in color.
• It is extremely porous, permeable, soft
and friable
• A biogenic type of sedimentary rock.
10. • Coal is an organic sedimentary rock
that forms from the accumulation and
preservation of plant materials, usually
in a swamp environment.
• Weathering often gives the coal a
greyish, yellowish, or rust-colored
coloring.
• It is rough in that it is a rock, but it has
a smooth, almost slippery quality as
well.
• A biogenic type of sedimentary rock.
